NEET UG PHYSICS MCQ: SEMI CONDUCTOR DEVICES

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Application +4 | -1

p - n\;

photodiode is made of a material with a band gap of 2.0 eV. The minimum frequency of the radiation that can be absorbed by the material is nearly

View answer and explanation

Correct option: B

5 \times {10^{14}}

Option B (

5 \times {10^{14}}

Hz) is correct because the minimum frequency is calculated using

E = hf

, where E is the band gap energy.

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I = A{T^2}{e^{q/{V_L}}}

{V_L}

\sqrt{n}.

n

p - n\;

{10^{17}}\mathrm{c}{\mathrm{m}^{ - 3}}

P

{10^{16}}

\mathrm{c}{\mathrm{m}^{ - 3}}

N

kT =

{n_i} = 1.4 \times {10^{10}}

\mathrm{c}{\mathrm{m}^{ - 3}}